Stephen Hawking's counter to the argument from design, called the
Weak Anthropic Principle, is very powerful, and
also very true. Sure, things like
fundamental constants of the universe, development of
solar system, development of our
planet (and
moon), and development of
ecology all must be very fine tuned for
intelligent life to exist, but seeing as how we do in fact exist, how can it be any other way? Even though the correct configuration is so
mind-bogglingly improbable, the need for an explanation is gone (even though there may be an explanation).
However,
If any design can be found in something unnecessary for humans, then the need for an explanation arises yet again. I'm thinking of a non-vital species that has an improbability for evolution. (Although, if the Designer were only minimally trying to make intelligence, we cannot expect to see any such extraneosities.)